.global _DBFillScreen
_DBFillScreen:
    push %edi
    mov $64000, %ecx
    mov 8(%esp), %eax
    mov _DblBuffer, %edi
    cld
    rep stosl
    pop %edi
    ret

.global _DBPSet
_DBPSet:
    mov 4(%esp), %ecx
    mov 8(%esp), %edx
    mov %edx, %eax
    shl $8, %edx
    shl $10, %eax
    add %edx, %eax
    lea _DblBuffer(%eax, %ecx, 4), %eax
    mov 12(%esp), %edx
    mov %edx, (%eax)
    ret

.global _DBPSetCAsm
_DBPSetCAsm:
    push %ebp
    mov %esp, %ebp
    mov 8(%ebp), %ecx
    mov 12(%ebp), %edx
    cmp (_clip_x1), %ecx
    jl _DBPSetCAsmEnd
    cmp (_clip_x2), %ecx
    jg _DBPSetCAsmEnd
    cmp (_clip_y1), %edx
    jl _DBPSetCAsmEnd
    cmp (_clip_y2), %edx
    jg _DBPSetCAsmEnd
    mov %edx, %eax
    shl $8, %edx
    shl $10, %eax
    add %edx, %eax
    lea _DblBuffer(%eax, %ecx, 4), %eax
    mov 16(%ebp), %edx
    mov %edx, (%eax)
_DBPSetCAsmEnd:
    pop %ebp
    ret

.global _DBCopyBufferAsm
_DBCopyBufferAsm:
    push %ebp
    mov %esp, %ebp
    mov 12(%ebp), %eax
    mov $320, %ebx
    mul %ebx
    add 8(%ebp), %eax
    shl $2, %eax
    add _DblBuffer, %eax
    mov %eax, %edi
    mov 16(%ebp), %esi
    mov 20(%ebp), %eax
    mov $320, %ecx
    sub %eax, %ecx
    inc %eax
    shl $2, %ecx
    mov 28(%ebp), %ebx
_DBCopyBufferLoop:
    dec %eax
    jz _DBCopyBufferRowEnd
    mov (%esi), %edx
    cmp %edx, %ebx
    jz _DBCopyBufferAddOffsets
    mov %edx, (%edi)
_DBCopyBufferAddOffsets:
    add $4, %esi
    add $4, %edi
    jmp _DBCopyBufferLoop
_DBCopyBufferRowEnd:
    decw 24(%ebp)
    jz _DBCopyBufferEnd
    mov 20(%ebp), %eax
    inc %eax
    add %ecx, %edi
    jmp _DBCopyBufferLoop
_DBCopyBufferEnd:
    pop %ebp
    ret

.global _DisplayDBAsm
_DisplayDBAsm:
    push %ecx
    push %esi
    push %edi
    mov $64000, %ecx
    mov _DblBuffer, %esi
    mov _VBuffer, %edi
    cld
    rep movsl
    pop %edi
    pop %esi
    pop %ecx
    /*dec %ecx
_DisplayDBAsmLoop:
    mov (%esi,%ecx,4), %eax
    mov %eax, (%edi,%ecx,4)
    dec %ecx
    jnz _DisplayDBAsmLoop*/
    ret

.global _MakeFarCall
_MakeFarCall:
    movl 12(%esp), %ebx
    movw 4(%ebx), %fs
    movl (%ebx), %esi
    movl %fs:(%esi), %eax
    .byte 38                       /*CALL FAR HWORD PTR ES:[EBX]*/
    .byte 255
    .byte 27
    ret

.global _ColorAdd
_ColorAdd:
    push %esi
    movd 12(%esp), %mm0
    movl 8(%esp), %esi
    movd (%esi), %mm1
    paddusb %mm1, %mm0
    movd %mm0, (%esi)
    pop %esi
    emms
    ret

.global _ColorSub
_ColorSub:
    push %esi
    movd 12(%esp), %mm0
    movl 8(%esp), %esi
    movd (%esi), %mm1
    psubusb %mm0, %mm1
    movd %mm1, (%esi)
    pop %esi
    emms
    ret

.global _DBCopyBufferTransAsm
_DBCopyBufferTrans:
    push %ebp
    movl %esp, %ebp
    push %edi
    push %esi
    push %ecx
    movl 12(%ebp), %edi
    movl %edi, %eax
    shll $10, %eax
    shll $8, %edi
    addl %eax, %edi
    movl 8(%ebp), %eax
    addl (_DblBuffer), %edi
    leal (%edi, %eax, 4), %edi
    movl 16(%ebp), %esi
    movl $1280, %eax
    movl 20(%ebp), %ebx
    shll $2, %ebx
    subl %ebx, %eax
    push %eax
    movl 32(%ebp), %eax
    movl _TransOps(, %eax, 4), %eax
    push %eax
DBCopyBufferTransYLoop:
    movl 20(%ebp), %ecx
DBCopyBufferTransXLoop:
    movl (%esi), %eax
    cmpl 28(%ebp), %eax
    je DBCopyBufferTransAddOffsets
    push %ecx
    push %edx
    push %eax
    push %edi
    call *-20(%ebp)
    add $8, %esp
    pop %edx
    pop %ecx
DBCopyBufferTransAddOffsets:
    add $4, %edi
    add $4, %esi
    loop DBCopyBufferTransXLoop
    addl -16(%ebp), %edi
    decl 24(%ebp)
    jnz DBCopyBufferTransYLoop
    add $8, %esp
    pop %ecx
    pop %esi
    pop %edi
    pop %ebp
    ret